diff options
Diffstat (limited to 'drivers/media/i2c/ov9282.c')
| -rw-r--r-- | drivers/media/i2c/ov9282.c | 1137 |
1 files changed, 1137 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c new file mode 100644 index 000000000000..2e0b315801e5 --- /dev/null +++ b/drivers/media/i2c/ov9282.c @@ -0,0 +1,1137 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * OmniVision ov9282 Camera Sensor Driver + * + * Copyright (C) 2021 Intel Corporation + */ +#include <asm/unaligned.h> + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> + +#include <media/v4l2-ctrls.h> +#include <media/v4l2-fwnode.h> +#include <media/v4l2-subdev.h> + +/* Streaming Mode */ +#define OV9282_REG_MODE_SELECT 0x0100 +#define OV9282_MODE_STANDBY 0x00 +#define OV9282_MODE_STREAMING 0x01 + +/* Lines per frame */ +#define OV9282_REG_LPFR 0x380e + +/* Chip ID */ +#define OV9282_REG_ID 0x300a +#define OV9282_ID 0x9281 + +/* Exposure control */ +#define OV9282_REG_EXPOSURE 0x3500 +#define OV9282_EXPOSURE_MIN 1 +#define OV9282_EXPOSURE_OFFSET 12 +#define OV9282_EXPOSURE_STEP 1 +#define OV9282_EXPOSURE_DEFAULT 0x0282 + +/* Analog gain control */ +#define OV9282_REG_AGAIN 0x3509 +#define OV9282_AGAIN_MIN 0x10 +#define OV9282_AGAIN_MAX 0xff +#define OV9282_AGAIN_STEP 1 +#define OV9282_AGAIN_DEFAULT 0x10 + +/* Group hold register */ +#define OV9282_REG_HOLD 0x3308 + +/* Input clock rate */ +#define OV9282_INCLK_RATE 24000000 + +/* CSI2 HW configuration */ +#define OV9282_LINK_FREQ 400000000 +#define OV9282_NUM_DATA_LANES 2 + +#define OV9282_REG_MIN 0x00 +#define OV9282_REG_MAX 0xfffff + +/** + * struct ov9282_reg - ov9282 sensor register + * @address: Register address + * @val: Register value + */ +struct ov9282_reg { + u16 address; + u8 val; +}; + +/** + * struct ov9282_reg_list - ov9282 sensor register list + * @num_of_regs: Number of registers in the list + * @regs: Pointer to register list + */ +struct ov9282_reg_list { + u32 num_of_regs; + const struct ov9282_reg *regs; +}; + +/** + * struct ov9282_mode - ov9282 sensor mode structure + * @width: Frame width + * @height: Frame height + * @code: Format code + * @hblank: Horizontal blanking in lines + * @vblank: Vertical blanking in lines + * @vblank_min: Minimum vertical blanking in lines + * @vblank_max: Maximum vertical blanking in lines + * @pclk: Sensor pixel clock + * @link_freq_idx: Link frequency index + * @reg_list: Register list for sensor mode + */ +struct ov9282_mode { + u32 width; + u32 height; + u32 code; + u32 hblank; + u32 vblank; + u32 vblank_min; + u32 vblank_max; + u64 pclk; + u32 link_freq_idx; + struct ov9282_reg_list reg_list; +}; + +/** + * struct ov9282 - ov9282 sensor device structure + * @dev: Pointer to generic device + * @client: Pointer to i2c client + * @sd: V4L2 sub-device + * @pad: Media pad. Only one pad supported + * @reset_gpio: Sensor reset gpio + * @inclk: Sensor input clock + * @ctrl_handler: V4L2 control handler + * @link_freq_ctrl: Pointer to link frequency control + * @pclk_ctrl: Pointer to pixel clock control + * @hblank_ctrl: Pointer to horizontal blanking control + * @vblank_ctrl: Pointer to vertical blanking control + * @exp_ctrl: Pointer to exposure control + * @again_ctrl: Pointer to analog gain control + * @vblank: Vertical blanking in lines + * @cur_mode: Pointer to current selected sensor mode + * @mutex: Mutex for serializing sensor controls + * @streaming: Flag indicating streaming state + */ +struct ov9282 { + struct device *dev; + struct i2c_client *client; + struct v4l2_subdev sd; + struct media_pad pad; + struct gpio_desc *reset_gpio; + struct clk *inclk; + struct v4l2_ctrl_handler ctrl_handler; + struct v4l2_ctrl *link_freq_ctrl; + struct v4l2_ctrl *pclk_ctrl; + struct v4l2_ctrl *hblank_ctrl; + struct v4l2_ctrl *vblank_ctrl; + struct { + struct v4l2_ctrl *exp_ctrl; + struct v4l2_ctrl *again_ctrl; + }; + u32 vblank; + const struct ov9282_mode *cur_mode; + struct mutex mutex; + bool streaming; +}; + +static const s64 link_freq[] = { + OV9282_LINK_FREQ, +}; + +/* Sensor mode registers */ +static const struct ov9282_reg mode_1280x720_regs[] = { + {0x0302, 0x32}, + {0x030d, 0x50}, + {0x030e, 0x02}, + {0x3001, 0x00}, + {0x3004, 0x00}, + {0x3005, 0x00}, + {0x3006, 0x04}, + {0x3011, 0x0a}, + {0x3013, 0x18}, + {0x301c, 0xf0}, + {0x3022, 0x01}, + {0x3030, 0x10}, + {0x3039, 0x32}, + {0x303a, 0x00}, + {0x3500, 0x00}, + {0x3501, 0x5f}, + {0x3502, 0x1e}, + {0x3503, 0x08}, + {0x3505, 0x8c}, + {0x3507, 0x03}, + {0x3508, 0x00}, + {0x3509, 0x10}, + {0x3610, 0x80}, + {0x3611, 0xa0}, + {0x3620, 0x6e}, + {0x3632, 0x56}, + {0x3633, 0x78}, + {0x3666, 0x00}, + {0x366f, 0x5a}, + {0x3680, 0x84}, + {0x3712, 0x80}, + {0x372d, 0x22}, + {0x3731, 0x80}, + {0x3732, 0x30}, + {0x3778, 0x00}, + {0x377d, 0x22}, + {0x3788, 0x02}, + {0x3789, 0xa4}, + {0x378a, 0x00}, + {0x378b, 0x4a}, + {0x3799, 0x20}, + {0x3800, 0x00}, + {0x3801, 0x00}, + {0x3802, 0x00}, + {0x3803, 0x00}, + {0x3804, 0x05}, + {0x3805, 0x0f}, + {0x3806, 0x02}, + {0x3807, 0xdf}, + {0x3808, 0x05}, + {0x3809, 0x00}, + {0x380a, 0x02}, + {0x380b, 0xd0}, + {0x380c, 0x05}, + {0x380d, 0xfa}, + {0x380e, 0x06}, + {0x380f, 0xce}, + {0x3810, 0x00}, + {0x3811, 0x08}, + {0x3812, 0x00}, + {0x3813, 0x08}, + {0x3814, 0x11}, + {0x3815, 0x11}, + {0x3820, 0x3c}, + {0x3821, 0x84}, + {0x3881, 0x42}, + {0x38a8, 0x02}, + {0x38a9, 0x80}, + {0x38b1, 0x00}, + {0x38c4, 0x00}, + {0x38c5, 0xc0}, + {0x38c6, 0x04}, + {0x38c7, 0x80}, + {0x3920, 0xff}, + {0x4003, 0x40}, + {0x4008, 0x02}, + {0x4009, 0x05}, + {0x400c, 0x00}, + {0x400d, 0x03}, + {0x4010, 0x40}, + {0x4043, 0x40}, + {0x4307, 0x30}, + {0x4317, 0x00}, + {0x4501, 0x00}, + {0x4507, 0x00}, + {0x4509, 0x80}, + {0x450a, 0x08}, + {0x4601, 0x04}, + {0x470f, 0x00}, + {0x4f07, 0x00}, + {0x4800, 0x20}, + {0x5000, 0x9f}, + {0x5001, 0x00}, + {0x5e00, 0x00}, + {0x5d00, 0x07}, + {0x5d01, 0x00}, + {0x0101, 0x01}, + {0x1000, 0x03}, + {0x5a08, 0x84}, +}; + +/* Supported sensor mode configurations */ +static const struct ov9282_mode supported_mode = { + .width = 1280, + .height = 720, + .hblank = 250, + .vblank = 1022, + .vblank_min = 151, + .vblank_max = 51540, + .pclk = 160000000, + .link_freq_idx = 0, + .code = MEDIA_BUS_FMT_Y10_1X10, + .reg_list = { + .num_of_regs = ARRAY_SIZE(mode_1280x720_regs), + .regs = mode_1280x720_regs, + }, +}; + +/** + * to_ov9282() - ov9282 V4L2 sub-device to ov9282 device. + * @subdev: pointer to ov9282 V4L2 sub-device + * + * Return: pointer to ov9282 device + */ +static inline struct ov9282 *to_ov9282(struct v4l2_subdev *subdev) +{ + return container_of(subdev, struct ov9282, sd); +} + +/** + * ov9282_read_reg() - Read registers. + * @ov9282: pointer to ov9282 device + * @reg: register address + * @len: length of bytes to read. Max supported bytes is 4 + * @val: pointer to register value to be filled. + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_read_reg(struct ov9282 *ov9282, u16 reg, u32 len, u32 *val) +{ + struct i2c_client *client = v4l2_get_subdevdata(&ov9282->sd); + struct i2c_msg msgs[2] = {0}; + u8 addr_buf[2] = {0}; + u8 data_buf[4] = {0}; + int ret; + + if (WARN_ON(len > 4)) + return -EINVAL; + + put_unaligned_be16(reg, addr_buf); + + /* Write register address */ + msgs[0].addr = client->addr; + msgs[0].flags = 0; + msgs[0].len = ARRAY_SIZE(addr_buf); + msgs[0].buf = addr_buf; + + /* Read data from register */ + msgs[1].addr = client->addr; + msgs[1].flags = I2C_M_RD; + msgs[1].len = len; + msgs[1].buf = &data_buf[4 - len]; + + ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (ret != ARRAY_SIZE(msgs)) + return -EIO; + + *val = get_unaligned_be32(data_buf); + + return 0; +} + +/** + * ov9282_write_reg() - Write register + * @ov9282: pointer to ov9282 device + * @reg: register address + * @len: length of bytes. Max supported bytes is 4 + * @val: register value + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_write_reg(struct ov9282 *ov9282, u16 reg, u32 len, u32 val) +{ + struct i2c_client *client = v4l2_get_subdevdata(&ov9282->sd); + u8 buf[6] = {0}; + + if (WARN_ON(len > 4)) + return -EINVAL; + + put_unaligned_be16(reg, buf); + put_unaligned_be32(val << (8 * (4 - len)), buf + 2); + if (i2c_master_send(client, buf, len + 2) != len + 2) + return -EIO; + + return 0; +} + +/** + * ov9282_write_regs() - Write a list of registers + * @ov9282: pointer to ov9282 device + * @regs: list of registers to be written + * @len: length of registers array + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_write_regs(struct ov9282 *ov9282, + const struct ov9282_reg *regs, u32 len) +{ + unsigned int i; + int ret; + + for (i = 0; i < len; i++) { + ret = ov9282_write_reg(ov9282, regs[i].address, 1, regs[i].val); + if (ret) + return ret; + } + + return 0; +} + +/** + * ov9282_update_controls() - Update control ranges based on streaming mode + * @ov9282: pointer to ov9282 device + * @mode: pointer to ov9282_mode sensor mode + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_update_controls(struct ov9282 *ov9282, + const struct ov9282_mode *mode) +{ + int ret; + + ret = __v4l2_ctrl_s_ctrl(ov9282->link_freq_ctrl, mode->link_freq_idx); + if (ret) + return ret; + + ret = __v4l2_ctrl_s_ctrl(ov9282->hblank_ctrl, mode->hblank); + if (ret) + return ret; + + return __v4l2_ctrl_modify_range(ov9282->vblank_ctrl, mode->vblank_min, + mode->vblank_max, 1, mode->vblank); +} + +/** + * ov9282_update_exp_gain() - Set updated exposure and gain + * @ov9282: pointer to ov9282 device + * @exposure: updated exposure value + * @gain: updated analog gain value + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_update_exp_gain(struct ov9282 *ov9282, u32 exposure, u32 gain) +{ + u32 lpfr; + int ret; + + lpfr = ov9282->vblank + ov9282->cur_mode->height; + + dev_dbg(ov9282->dev, "Set exp %u, analog gain %u, lpfr %u", + exposure, gain, lpfr); + + ret = ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 1); + if (ret) + return ret; + + ret = ov9282_write_reg(ov9282, OV9282_REG_LPFR, 2, lpfr); + if (ret) + goto error_release_group_hold; + + ret = ov9282_write_reg(ov9282, OV9282_REG_EXPOSURE, 3, exposure << 4); + if (ret) + goto error_release_group_hold; + + ret = ov9282_write_reg(ov9282, OV9282_REG_AGAIN, 1, gain); + +error_release_group_hold: + ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 0); + + return ret; +} + +/** + * ov9282_set_ctrl() - Set subdevice control + * @ctrl: pointer to v4l2_ctrl structure + * + * Supported controls: + * - V4L2_CID_VBLANK + * - cluster controls: + * - V4L2_CID_ANALOGUE_GAIN + * - V4L2_CID_EXPOSURE + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_set_ctrl(struct v4l2_ctrl *ctrl) +{ + struct ov9282 *ov9282 = + container_of(ctrl->handler, struct ov9282, ctrl_handler); + u32 analog_gain; + u32 exposure; + int ret; + + switch (ctrl->id) { + case V4L2_CID_VBLANK: + ov9282->vblank = ov9282->vblank_ctrl->val; + + dev_dbg(ov9282->dev, "Received vblank %u, new lpfr %u", + ov9282->vblank, + ov9282->vblank + ov9282->cur_mode->height); + + ret = __v4l2_ctrl_modify_range(ov9282->exp_ctrl, + OV9282_EXPOSURE_MIN, + ov9282->vblank + + ov9282->cur_mode->height - + OV9282_EXPOSURE_OFFSET, + 1, OV9282_EXPOSURE_DEFAULT); + break; + case V4L2_CID_EXPOSURE: + /* Set controls only if sensor is in power on state */ + if (!pm_runtime_get_if_in_use(ov9282->dev)) + return 0; + + exposure = ctrl->val; + analog_gain = ov9282->again_ctrl->val; + + dev_dbg(ov9282->dev, "Received exp %u, analog gain %u", + exposure, analog_gain); + + ret = ov9282_update_exp_gain(ov9282, exposure, analog_gain); + + pm_runtime_put(ov9282->dev); + + break; + default: + dev_err(ov9282->dev, "Invalid control %d", ctrl->id); + ret = -EINVAL; + } + + return ret; +} + +/* V4l2 subdevice control ops*/ +static const struct v4l2_ctrl_ops ov9282_ctrl_ops = { + .s_ctrl = ov9282_set_ctrl, +}; + +/** + * ov9282_enum_mbus_code() - Enumerate V4L2 sub-device mbus codes + * @sd: pointer to ov9282 V4L2 sub-device structure + * @sd_state: V4L2 sub-device configuration + * @code: V4L2 sub-device code enumeration need to be filled + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_enum_mbus_code(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_mbus_code_enum *code) +{ + if (code->index > 0) + return -EINVAL; + + code->code = supported_mode.code; + + return 0; +} + +/** + * ov9282_enum_frame_size() - Enumerate V4L2 sub-device frame sizes + * @sd: pointer to ov9282 V4L2 sub-device structure + * @sd_state: V4L2 sub-device configuration + * @fsize: V4L2 sub-device size enumeration need to be filled + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_enum_frame_size(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_frame_size_enum *fsize) +{ + if (fsize->index > 0) + return -EINVAL; + + if (fsize->code != supported_mode.code) + return -EINVAL; + + fsize->min_width = supported_mode.width; + fsize->max_width = fsize->min_width; + fsize->min_height = supported_mode.height; + fsize->max_height = fsize->min_height; + + return 0; +} + +/** + * ov9282_fill_pad_format() - Fill subdevice pad format + * from selected sensor mode + * @ov9282: pointer to ov9282 device + * @mode: pointer to ov9282_mode sensor mode + * @fmt: V4L2 sub-device format need to be filled + */ +static void ov9282_fill_pad_format(struct ov9282 *ov9282, + const struct ov9282_mode *mode, + struct v4l2_subdev_format *fmt) +{ + fmt->format.width = mode->width; + fmt->format.height = mode->height; + fmt->format.code = mode->code; + fmt->format.field = V4L2_FIELD_NONE; + fmt->format.colorspace = V4L2_COLORSPACE_RAW; + fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT; + fmt->format.quantization = V4L2_QUANTIZATION_DEFAULT; + fmt->format.xfer_func = V4L2_XFER_FUNC_NONE; +} + +/** + * ov9282_get_pad_format() - Get subdevice pad format + * @sd: pointer to ov9282 V4L2 sub-device structure + * @sd_state: V4L2 sub-device configuration + * @fmt: V4L2 sub-device format need to be set + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_get_pad_format(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *fmt) +{ + struct ov9282 *ov9282 = to_ov9282(sd); + + mutex_lock(&ov9282->mutex); + + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) { + struct v4l2_mbus_framefmt *framefmt; + + framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad); + fmt->format = *framefmt; + } else { + ov9282_fill_pad_format(ov9282, ov9282->cur_mode, fmt); + } + + mutex_unlock(&ov9282->mutex); + + return 0; +} + +/** + * ov9282_set_pad_format() - Set subdevice pad format + * @sd: pointer to ov9282 V4L2 sub-device structure + * @sd_state: V4L2 sub-device configuration + * @fmt: V4L2 sub-device format need to be set + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_set_pad_format(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + struct v4l2_subdev_format *fmt) +{ + struct ov9282 *ov9282 = to_ov9282(sd); + const struct ov9282_mode *mode; + int ret = 0; + + mutex_lock(&ov9282->mutex); + + mode = &supported_mode; + ov9282_fill_pad_format(ov9282, mode, fmt); + + if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) { + struct v4l2_mbus_framefmt *framefmt; + + framefmt = v4l2_subdev_get_try_format(sd, sd_state, fmt->pad); + *framefmt = fmt->format; + } else { + ret = ov9282_update_controls(ov9282, mode); + if (!ret) + ov9282->cur_mode = mode; + } + + mutex_unlock(&ov9282->mutex); + + return ret; +} + +/** + * ov9282_init_pad_cfg() - Initialize sub-device pad configuration + * @sd: pointer to ov9282 V4L2 sub-device structure + * @sd_state: V4L2 sub-device configuration + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_init_pad_cfg(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state) +{ + struct ov9282 *ov9282 = to_ov9282(sd); + struct v4l2_subdev_format fmt = { 0 }; + + fmt.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE; + ov9282_fill_pad_format(ov9282, &supported_mode, &fmt); + + return ov9282_set_pad_format(sd, sd_state, &fmt); +} + +/** + * ov9282_start_streaming() - Start sensor stream + * @ov9282: pointer to ov9282 device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_start_streaming(struct ov9282 *ov9282) +{ + const struct ov9282_reg_list *reg_list; + int ret; + + /* Write sensor mode registers */ + reg_list = &ov9282->cur_mode->reg_list; + ret = ov9282_write_regs(ov9282, reg_list->regs, reg_list->num_of_regs); + if (ret) { + dev_err(ov9282->dev, "fail to write initial registers"); + return ret; + } + + /* Setup handler will write actual exposure and gain */ + ret = __v4l2_ctrl_handler_setup(ov9282->sd.ctrl_handler); + if (ret) { + dev_err(ov9282->dev, "fail to setup handler"); + return ret; + } + + /* Start streaming */ + ret = ov9282_write_reg(ov9282, OV9282_REG_MODE_SELECT, + 1, OV9282_MODE_STREAMING); + if (ret) { + dev_err(ov9282->dev, "fail to start streaming"); + return ret; + } + + return 0; +} + +/** + * ov9282_stop_streaming() - Stop sensor stream + * @ov9282: pointer to ov9282 device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_stop_streaming(struct ov9282 *ov9282) +{ + return ov9282_write_reg(ov9282, OV9282_REG_MODE_SELECT, + 1, OV9282_MODE_STANDBY); +} + +/** + * ov9282_set_stream() - Enable sensor streaming + * @sd: pointer to ov9282 subdevice + * @enable: set to enable sensor streaming + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_set_stream(struct v4l2_subdev *sd, int enable) +{ + struct ov9282 *ov9282 = to_ov9282(sd); + int ret; + + mutex_lock(&ov9282->mutex); + + if (ov9282->streaming == enable) { + mutex_unlock(&ov9282->mutex); + return 0; + } + + if (enable) { + ret = pm_runtime_resume_and_get(ov9282->dev); + if (ret) + goto error_unlock; + + ret = ov9282_start_streaming(ov9282); + if (ret) + goto error_power_off; + } else { + ov9282_stop_streaming(ov9282); + pm_runtime_put(ov9282->dev); + } + + ov9282->streaming = enable; + + mutex_unlock(&ov9282->mutex); + + return 0; + +error_power_off: + pm_runtime_put(ov9282->dev); +error_unlock: + mutex_unlock(&ov9282->mutex); + + return ret; +} + +/** + * ov9282_detect() - Detect ov9282 sensor + * @ov9282: pointer to ov9282 device + * + * Return: 0 if successful, -EIO if sensor id does not match + */ +static int ov9282_detect(struct ov9282 *ov9282) +{ + int ret; + u32 val; + + ret = ov9282_read_reg(ov9282, OV9282_REG_ID, 2, &val); + if (ret) + return ret; + + if (val != OV9282_ID) { + dev_err(ov9282->dev, "chip id mismatch: %x!=%x", + OV9282_ID, val); + return -ENXIO; + } + + return 0; +} + +/** + * ov9282_parse_hw_config() - Parse HW configuration and check if supported + * @ov9282: pointer to ov9282 device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_parse_hw_config(struct ov9282 *ov9282) +{ + struct fwnode_handle *fwnode = dev_fwnode(ov9282->dev); + struct v4l2_fwnode_endpoint bus_cfg = { + .bus_type = V4L2_MBUS_CSI2_DPHY + }; + struct fwnode_handle *ep; + unsigned long rate; + unsigned int i; + int ret; + + if (!fwnode) + return -ENXIO; + + /* Request optional reset pin */ + ov9282->reset_gpio = devm_gpiod_get_optional(ov9282->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(ov9282->reset_gpio)) { + dev_err(ov9282->dev, "failed to get reset gpio %ld", + PTR_ERR(ov9282->reset_gpio)); + return PTR_ERR(ov9282->reset_gpio); + } + + /* Get sensor input clock */ + ov9282->inclk = devm_clk_get(ov9282->dev, NULL); + if (IS_ERR(ov9282->inclk)) { + dev_err(ov9282->dev, "could not get inclk"); + return PTR_ERR(ov9282->inclk); + } + + rate = clk_get_rate(ov9282->inclk); + if (rate != OV9282_INCLK_RATE) { + dev_err(ov9282->dev, "inclk frequency mismatch"); + return -EINVAL; + } + + ep = fwnode_graph_get_next_endpoint(fwnode, NULL); + if (!ep) + return -ENXIO; + + ret = v4l2_fwnode_endpoint_alloc_parse(ep, &bus_cfg); + fwnode_handle_put(ep); + if (ret) + return ret; + + if (bus_cfg.bus.mipi_csi2.num_data_lanes != OV9282_NUM_DATA_LANES) { + dev_err(ov9282->dev, + "number of CSI2 data lanes %d is not supported", + bus_cfg.bus.mipi_csi2.num_data_lanes); + ret = -EINVAL; + goto done_endpoint_free; + } + + if (!bus_cfg.nr_of_link_frequencies) { + dev_err(ov9282->dev, "no link frequencies defined"); + ret = -EINVAL; + goto done_endpoint_free; + } + + for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++) + if (bus_cfg.link_frequencies[i] == OV9282_LINK_FREQ) + goto done_endpoint_free; + + ret = -EINVAL; + +done_endpoint_free: + v4l2_fwnode_endpoint_free(&bus_cfg); + + return ret; +} + +/* V4l2 subdevice ops */ +static const struct v4l2_subdev_video_ops ov9282_video_ops = { + .s_stream = ov9282_set_stream, +}; + +static const struct v4l2_subdev_pad_ops ov9282_pad_ops = { + .init_cfg = ov9282_init_pad_cfg, + .enum_mbus_code = ov9282_enum_mbus_code, + .enum_frame_size = ov9282_enum_frame_size, + .get_fmt = ov9282_get_pad_format, + .set_fmt = ov9282_set_pad_format, +}; + +static const struct v4l2_subdev_ops ov9282_subdev_ops = { + .video = &ov9282_video_ops, + .pad = &ov9282_pad_ops, +}; + +/** + * ov9282_power_on() - Sensor power on sequence + * @dev: pointer to i2c device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_power_on(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov9282 *ov9282 = to_ov9282(sd); + int ret; + + usleep_range(400, 600); + + gpiod_set_value_cansleep(ov9282->reset_gpio, 1); + + ret = clk_prepare_enable(ov9282->inclk); + if (ret) { + dev_err(ov9282->dev, "fail to enable inclk"); + goto error_reset; + } + + usleep_range(400, 600); + + return 0; + +error_reset: + gpiod_set_value_cansleep(ov9282->reset_gpio, 0); + + return ret; +} + +/** + * ov9282_power_off() - Sensor power off sequence + * @dev: pointer to i2c device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_power_off(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov9282 *ov9282 = to_ov9282(sd); + + gpiod_set_value_cansleep(ov9282->reset_gpio, 0); + + clk_disable_unprepare(ov9282->inclk); + + return 0; +} + +/** + * ov9282_init_controls() - Initialize sensor subdevice controls + * @ov9282: pointer to ov9282 device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_init_controls(struct ov9282 *ov9282) +{ + struct v4l2_ctrl_handler *ctrl_hdlr = &ov9282->ctrl_handler; + const struct ov9282_mode *mode = ov9282->cur_mode; + u32 lpfr; + int ret; + + ret = v4l2_ctrl_handler_init(ctrl_hdlr, 6); + if (ret) + return ret; + + /* Serialize controls with sensor device */ + ctrl_hdlr->lock = &ov9282->mutex; + + /* Initialize exposure and gain */ + lpfr = mode->vblank + mode->height; + ov9282->exp_ctrl = v4l2_ctrl_new_std(ctrl_hdlr, + &ov9282_ctrl_ops, + V4L2_CID_EXPOSURE, + OV9282_EXPOSURE_MIN, + lpfr - OV9282_EXPOSURE_OFFSET, + OV9282_EXPOSURE_STEP, + OV9282_EXPOSURE_DEFAULT); + + ov9282->again_ctrl = v4l2_ctrl_new_std(ctrl_hdlr, + &ov9282_ctrl_ops, + V4L2_CID_ANALOGUE_GAIN, + OV9282_AGAIN_MIN, + OV9282_AGAIN_MAX, + OV9282_AGAIN_STEP, + OV9282_AGAIN_DEFAULT); + + v4l2_ctrl_cluster(2, &ov9282->exp_ctrl); + + ov9282->vblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr, + &ov9282_ctrl_ops, + V4L2_CID_VBLANK, + mode->vblank_min, + mode->vblank_max, + 1, mode->vblank); + + /* Read only controls */ + ov9282->pclk_ctrl = v4l2_ctrl_new_std(ctrl_hdlr, + &ov9282_ctrl_ops, + V4L2_CID_PIXEL_RATE, + mode->pclk, mode->pclk, + 1, mode->pclk); + + ov9282->link_freq_ctrl = v4l2_ctrl_new_int_menu(ctrl_hdlr, + &ov9282_ctrl_ops, + V4L2_CID_LINK_FREQ, + ARRAY_SIZE(link_freq) - + 1, + mode->link_freq_idx, + link_freq); + if (ov9282->link_freq_ctrl) + ov9282->link_freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; + + ov9282->hblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr, + &ov9282_ctrl_ops, + V4L2_CID_HBLANK, + OV9282_REG_MIN, + OV9282_REG_MAX, + 1, mode->hblank); + if (ov9282->hblank_ctrl) + ov9282->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; + + if (ctrl_hdlr->error) { + dev_err(ov9282->dev, "control init failed: %d", + ctrl_hdlr->error); + v4l2_ctrl_handler_free(ctrl_hdlr); + return ctrl_hdlr->error; + } + + ov9282->sd.ctrl_handler = ctrl_hdlr; + + return 0; +} + +/** + * ov9282_probe() - I2C client device binding + * @client: pointer to i2c client device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_probe(struct i2c_client *client) +{ + struct ov9282 *ov9282; + int ret; + + ov9282 = devm_kzalloc(&client->dev, sizeof(*ov9282), GFP_KERNEL); + if (!ov9282) + return -ENOMEM; + + ov9282->dev = &client->dev; + + /* Initialize subdev */ + v4l2_i2c_subdev_init(&ov9282->sd, client, &ov9282_subdev_ops); + + ret = ov9282_parse_hw_config(ov9282); + if (ret) { + dev_err(ov9282->dev, "HW configuration is not supported"); + return ret; + } + + mutex_init(&ov9282->mutex); + + ret = ov9282_power_on(ov9282->dev); + if (ret) { + dev_err(ov9282->dev, "failed to power-on the sensor"); + goto error_mutex_destroy; + } + + /* Check module identity */ + ret = ov9282_detect(ov9282); + if (ret) { + dev_err(ov9282->dev, "failed to find sensor: %d", ret); + goto error_power_off; + } + + /* Set default mode to max resolution */ + ov9282->cur_mode = &supported_mode; + ov9282->vblank = ov9282->cur_mode->vblank; + + ret = ov9282_init_controls(ov9282); + if (ret) { + dev_err(ov9282->dev, "failed to init controls: %d", ret); + goto error_power_off; + } + + /* Initialize subdev */ + ov9282->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + ov9282->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR; + + /* Initialize source pad */ + ov9282->pad.flags = MEDIA_PAD_FL_SOURCE; + ret = media_entity_pads_init(&ov9282->sd.entity, 1, &ov9282->pad); + if (ret) { + dev_err(ov9282->dev, "failed to init entity pads: %d", ret); + goto error_handler_free; + } + + ret = v4l2_async_register_subdev_sensor(&ov9282->sd); + if (ret < 0) { + dev_err(ov9282->dev, + "failed to register async subdev: %d", ret); + goto error_media_entity; + } + + pm_runtime_set_active(ov9282->dev); + pm_runtime_enable(ov9282->dev); + pm_runtime_idle(ov9282->dev); + + return 0; + +error_media_entity: + media_entity_cleanup(&ov9282->sd.entity); +error_handler_free: + v4l2_ctrl_handler_free(ov9282->sd.ctrl_handler); +error_power_off: + ov9282_power_off(ov9282->dev); +error_mutex_destroy: + mutex_destroy(&ov9282->mutex); + + return ret; +} + +/** + * ov9282_remove() - I2C client device unbinding + * @client: pointer to I2C client device + * + * Return: 0 if successful, error code otherwise. + */ +static int ov9282_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct ov9282 *ov9282 = to_ov9282(sd); + + v4l2_async_unregister_subdev(sd); + media_entity_cleanup(&sd->entity); + v4l2_ctrl_handler_free(sd->ctrl_handler); + + pm_runtime_disable(&client->dev); + if (!pm_runtime_status_suspended(&client->dev)) + ov9282_power_off(&client->dev); + pm_runtime_set_suspended(&client->dev); + + mutex_destroy(&ov9282->mutex); + + return 0; +} + +static const struct dev_pm_ops ov9282_pm_ops = { + SET_RUNTIME_PM_OPS(ov9282_power_off, ov9282_power_on, NULL) +}; + +static const struct of_device_id ov9282_of_match[] = { + { .compatible = "ovti,ov9282" }, + { } +}; + +MODULE_DEVICE_TABLE(of, ov9282_of_match); + +static struct i2c_driver ov9282_driver = { + .probe_new = ov9282_probe, + .remove = ov9282_remove, + .driver = { + .name = "ov9282", + .pm = &ov9282_pm_ops, + .of_match_table = ov9282_of_match, + }, +}; + +module_i2c_driver(ov9282_driver); + +MODULE_DESCRIPTION("OmniVision ov9282 sensor driver"); +MODULE_LICENSE("GPL"); |